PSN-L Email List Message

Subject: Re: seismometer/site sensitivity
From: Pete Rowe ptrowe@.........
Date: Thu, 11 Oct 2007 12:45:49 -0700 (PDT)

Hi Jan
I'd say that you are doing just fine. With my 3 second
period horizontal I see 5s down in Mexico, 7s
anywhere, but a 1.3 needs to be with in 3 or 4 miles.
I have never gone to the trouble of actually trying to
calibrate mine because I really don't know how to do
it and haven't taken the time to learn. The gain
numbers that I use in Larry's program are just
--- Jan Froom  wrote:

> I'm curious how many of you have come up with a
> "rule of thumb" for the 
> general sensitivity of your seismometers.
> For instance I have sensed a 3.0 sixty miles out
> from my seismometer, 
> and have seen 5s within 300 miles.
> And I understand we should be able to sense a 7
> anywhere in the world.
> But just now, I did not see a 1.3  seven miles out.
> So my question.... is this good, bad, average?
> I'm sure there are lots of variables such as type of
> instrument, 
> orientation, ambient noise, etc..
> but still, shouldn't there be a general feeling or
> rule of thumb.
> Jan in Gilroy

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